Week2 Project - United States Zip Code Location Leaflet Map

Date: Janurary 27 2017

Click on each marker to show cooresponding zip code and city & state names.

library(leaflet)
library(zipcode)
library(maps)

data("zipcode")     # load data zipcode
str(zipcode)    # dataset contain city state, latitude, and longitude of each zipcode

## 'data.frame':    44336 obs. of  5 variables:
##  $ zip      : chr  "00210" "00211" "00212" "00213" ...
##  $ city     : chr  "Portsmouth" "Portsmouth" "Portsmouth" "Portsmouth" ...
##  $ state    : chr  "NH" "NH" "NH" "NH" ...
##  $ latitude : num  43 43 43 43 43 ...
##  $ longitude: num  -71 -71 -71 -71 -71 ...

CleanZ<-zipcode[!(is.na(zipcode[,4])|is.na(zipcode[,5])),]  # remove rows with missing latitude and longitude
mapStates <- map("county", fill = TRUE, plot = FALSE)   # mapdata of US county boundaries
Zip_map<-leaflet(data = mapStates) %>%           # creates a Leaflet map based on the county boundries    
    addTiles() %>%      # Add graphics elements and layers to the map widget
    addPolygons(fillColor = topo.colors(10, alpha = NULL), stroke = FALSE)%>%       # fill counties with colors
    addMarkers(lat=CleanZ$latitude,lng=CleanZ$longitude, 
                     popup = paste0("Zip Code: ",CleanZ$zip,'<br/>', CleanZ$city, ", ", CleanZ$state) ,  
                     clusterOptions = markerClusterOptions())       # add zipcode latitude, longtitude, and city & state names
Zip_map      #display the Zip Code Leaflet map